In about 120AD, the Tenth Doctor learned that Roman authorities kept giraffes as a part of a menagerie that included leopards, elephants and a wide range of other, chiefly African, animals. Some of the beasts were kept for hunting, and others were used to face off against prisoners in local arenas. The Doctor was incensed by the practise, because he knew it would lead to the extinction of several of the species. (PROSE: The Stone Rose)